CAJ | 학술논문

运动估计技术是H.264的关键技术，其消耗整个编码时间80%左右。提出了一种更加合理的模板策略，该策略可以更快地接近最优运动矢量；引入了运动类型判断机制以避免不必要的搜索。在UMHS算法上应用了这两种策略，保持了原有图像质量的同时有效地节省了运动估计时间。实验结果显示，优化后的算法与原UMHS算法和EPZS算法相比，在重建图像质量和码率接近的情况下，运动估计时间分别节省了约30%和15%，特别是当视频内容比较剧烈时分别节省了约40%和25%。
운동고계기술시H.264적관건기술，기소모정개편마시간80%좌우。제출료일충경가합리적모판책략，해책략가이경쾌지접근최우운동시량；인입료운동류형판단궤제이피면불필요적수색。재UMHS산법상응용료저량충책략，보지료원유도상질량적동시유효지절성료운동고계시간。실험결과현시，우화후적산법여원UMHS산법화EPZS산법상비，재중건도상질량화마솔접근적정황하，운동고계시간분별절성료약30%화15%，특별시당시빈내용비교극렬시분별절성료약40%화25%。
Motion estimation takes almost 80%of the overall encoding time in H.264. This paper proposes a more reason-able pattern strategy that can access the best MV faster and introduces the tactics that can avoid unnecessary search;then realizes the proposed methods on UMHS. The novel algorithm saves encoding time effectively, which maintains the video quality simultaneously. Experimental results show that the advanced one can save about 30%and 15%ME time compared to UMHS algorithm and EPZS algorithm but has no change in the reconstructed video quality and bit-rate, which even reaches about 40%and 25%ME time-saving under fast motion video.